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| author |   Christoph Hellwig <hch@lst.de> | 2017-02-05 18:15:23 +0100 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2017-02-27 20:54:05 +0200 |
| commit | bbaba479563910aaa51e59bb9027a09e396d3a3c (patch) | |
| tree | 0c67858d20c8a87b3abfc8cd4baf4f68ce84165c /drivers/virtio/virtio_pci_common.c | |
| parent | virtio: allow drivers to request IRQ affinity when creating VQs (diff) | |
| download | linux-dev-bbaba479563910aaa51e59bb9027a09e396d3a3c.tar.xz linux-dev-bbaba479563910aaa51e59bb9027a09e396d3a3c.zip | |
virtio: provide a method to get the IRQ affinity mask for a virtqueue
This basically passed up the pci_irq_get_affinity information through
virtio through an optional get_vq_affinity method. It is only implemented
by the PCI backend for now, and only when we use per-virtqueue IRQs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_pci_common.c')
| -rw-r--r-- | drivers/virtio/virtio_pci_common.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index 7902e920fc73..df548a6fb844 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -361,6 +361,17 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu) return 0; } +const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) +{ + struct virtio_pci_device *vp_dev = to_vp_device(vdev); + unsigned int *map = vp_dev->msix_vector_map; + + if (!map || map[index] == VIRTIO_MSI_NO_VECTOR) + return NULL; + + return pci_irq_get_affinity(vp_dev->pci_dev, map[index]); +} + #ifdef CONFIG_PM_SLEEP static int virtio_pci_freeze(struct device *dev) { |